During the invasion of Parthia, two Roman legions have been brought to a standstill in the snowy mountains of Armenia, leaving them slowly dying in the freezing cold. The rest of the Roman army is a two weeks' march away, and the region swarms with Parthian patrols. Their only hope for survival is Noreno, a half-Roman soldier, who is entrusted with the impossible mission of crossing the deadly terrain to seek help for his men and turn the tide of the battle.